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Capitalization (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Carrying amount |  |
First Mortgage Bonds | $ 89,565 | $ 91,938
SRF Bonds | 701 | 708
Fair value |  |
First Mortgage Bonds | 84,195 | 93,556
SRF Bonds | $ 704 | $ 712

X
- Definition Represents the aggregate of the first mortgage bonds reported on the balance sheet at period end measured at fair value by the entity. + References No definition available. + Details
Name: | msex_FirstMortgageBondsFairValueDisclosure
Namespace Prefix: | msex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the aggregate of the state revolving fund reported on the balance sheet at period end measured at fair value by the entity. + References No definition available. + Details
Name: | msex_StateRevolvingFundBondsFairValueDisclosure
Namespace Prefix: | msex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant